CN103821523A - Excavating method for extending existing single-hole two-driveway tunnel into four-driveway tunnel - Google Patents
Excavating method for extending existing single-hole two-driveway tunnel into four-driveway tunnel Download PDFInfo
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- CN103821523A CN103821523A CN201410044970.1A CN201410044970A CN103821523A CN 103821523 A CN103821523 A CN 103821523A CN 201410044970 A CN201410044970 A CN 201410044970A CN 103821523 A CN103821523 A CN 103821523A
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Abstract
The invention discloses an excavating method for extending an existing single-hole two-driveway tunnel into a four-driveway tunnel. The excavating method includes steps of 1), filling the existing tunnel with soil until portions below a haunch of the existing tunnel are filled with the soil; 2), excavating a tunnel extending left-side upper guide pit; 3), excavating a tunnel extending left-side lower guide pit; 4), excavating a tunnel extending right-side upper guide pit; 5), excavating a tunnel extending right-side lower guide pit; 6), constructing a second-layer primary support of a tunnel extending inverted arch and a secondary lining of the inverted arch; 7), dismantling temporary supports of side walls of the left-side upper guide pit and the left-side lower guide pit and temporary inverted arches of the left-side upper guide pit and the right-side upper guide pit; 8), constructing a second-layer primary support of a tunnel extending arch wall, laying annular blind ditches and waterproof plates and integrally pouring a secondary lining of the arch wall. The excavating method has the advantages that the tunnel is filled with the soil, so that the pressure of surrounding rock can be temporarily balanced; the pilot guide pits are excavated on a free face of the existing tunnel, accordingly, a disturbance range of the surrounding rock can be effectively reduced, and the extra-large-span tunnel extension construction safety can be improved.
Description
Technical field
The present invention relates to construction of tunnel field, relate in particular to the excavation method that a kind of existing single-hole two track tunnel enlargings are highway tunnel with four lanes.
Background technology
Along with developing rapidly of China's economic construction, also rapid growth of the construction of traffic tunnel is also more and more higher to the requirement of highway tunnel daily traffic volume.In some developed areas, existing highway tunnel can not adapt to the growing demand of the traffic volume, and on existing highway tunnel basis, enlarging becomes the more construction of Large Span Road Tunnel and seems particularly urgent.
Existing tunnel extension project is because of technical sophistication, and difficulty of construction is large, and domestic similar engineering is less, and the engineering practice that particularly existing single-hole two track tunnel enlargings are highway tunnel with four lanes approaches blank especially.Forming narrow-bore tunnel at the excavation of existing tunnel extends in the process of large cross-section tunnel to removing existing tunnel liner structure, the stress state of tunnel surrounding process is intricate, reasonably excavation method is larger on country rock disturbance and tunnel deformation impact, directly the safety of impact enlarging construction.
Summary of the invention
Goal of the invention of the present invention is to solve the problems of the technologies described above, and the excavation method that a kind of existing single-hole two track tunnel enlargings that reduce country rock range of disturbance and raising working security are highway tunnel with four lanes is provided.
In order to realize foregoing invention object, the technical solution used in the present invention is:
The excavation method that existing single-hole two track tunnel enlargings are highway tunnel with four lanes, comprises the following steps:
1) backfill existing tunnel is to its haunch place, and compacting;
2) left side, excavation enlarging tunnel top heading, specifically comprises: remove supporting and protection structure more than existing tunnel haunch, the top heading first floor preliminary bracing of construction left side, sidewall temporary lining, interim inverted arch and lock pin ductule;
3) the lower base tunnel in left side, excavation enlarging tunnel, specifically comprises: remove supporting and protection structure and road surface below existing tunnel haunch, the lower base tunnel first floor preliminary bracing in construction left side and sidewall temporary lining;
4) excavation enlarging right side, tunnel top heading, specifically comprises: construction right side top heading first floor preliminary bracing, interim inverted arch and lock pin ductule;
5) base tunnel under excavation enlarging right side, tunnel, specifically comprises: base tunnel and right side top heading under base tunnel first floor preliminary bracing under construction right side, right side;
6) construction enlarging tunnel invert second layer preliminary bracing and inverted arch secondary lining;
7) the sidewall temporary lining of base tunnel under dismounting left side top heading and left side, and the interim inverted arch of left side top heading and right side top heading;
8) construction enlarging tunnel arch wall second layer preliminary bracing, lays hoop french drain and splash guard, monobloc cast arch wall portion secondary lining.
Wherein, in step 1), backfill adopts backfill back-filling in layers, and compaction in layers.
Wherein, step 2) in the temporary lining of top heading sidewall be arranged on the right positions near existing tunnel supporting and protection structure, lock pin ductule is two, every pin, is less than or equal to 30 ° with the vertical line angle of cut.
Wherein, in step 3), lower base tunnel sidewall temporary lining is arranged on the right positions near existing tunnel supporting and protection structure, and connects with the temporary lining of top heading sidewall is suitable.
Wherein, under left side, base tunnel and left side top heading longitudinal pitch are less than 5m, and seal into ring in time.
Wherein, in step 5), under right side, base tunnel and right side top heading longitudinal pitch are less than 5m, and under right side, under base tunnel and left side, base tunnel longitudinal pitch is greater than 15m.
Beneficial effect of the present invention is: this excavation method realizes the interim balance of pressure from surrounding rock by backfill existing tunnel, utilize the free face of existing tunnel to carry out the excavation of base tunnel in advance, effectively reduce the range of disturbance of country rock, improve the safety of super-large span tunnel enlarging construction.
Accompanying drawing explanation
Fig. 1 is the constructing structure schematic diagram in the embodiment of the present invention.
1: backfill; 2: existing tunnel supporting and protection structure; 3: left side top heading; 4: first floor preliminary bracing; 5: the temporary lining of top heading sidewall; 6: the interim inverted arch of left side top heading; 7: lock pin ductule; 8: base tunnel under left side; 9: the temporary lining of lower base tunnel sidewall; 10: right side top heading; 11: the interim inverted arch of right side top heading; 12: base tunnel under right side; 13: second layer preliminary bracing; 14: secondary lining.
The specific embodiment
By describing technology contents of the present invention, structural feature in detail, being realized object and effect, below in conjunction with embodiment and coordinate accompanying drawing to be explained in detail.
See also Fig. 1, as shown in the figure, the excavation method that existing single-hole two track tunnel enlargings of the present invention are highway tunnel with four lanes, comprises the following steps:
1) backfill existing tunnel, to haunch, adopts backfill 1, and compaction in layers;
2) excavate in advance left side, enlarging tunnel top heading 3, comprise and remove the above existing tunnel supporting and protection structure 2 of haunch, top heading first floor preliminary bracing 4 on the left of construction, top heading sidewall temporary lining 5, the interim inverted arch 6 of left side top heading and lock pin ductule 7.Top heading sidewall temporary lining 5 is arranged on the right positions near existing tunnel supporting and protection structure 2.Lock pin ductule 7 is 2, every pin, should not be greater than 30 °, to guarantee to lock pin effect with the vertical line angle of cut.
3) the lower base tunnel 8 in left side, excavation enlarging tunnel, comprises and removes the following existing tunnel supporting and protection structure 2 of haunch and road surface, the lower base tunnel first floor preliminary bracing 4 in construction left side and lower base tunnel sidewall temporary lining 9.Lower base tunnel sidewall temporary lining 9 is arranged on the right positions near existing tunnel supporting and protection structure 2, and connects with top heading sidewall temporary lining 5 is suitable.The lower base tunnel 8 in left side and left side top heading 3 longitudinal pitches should not be greater than 5m, and seal into ring in time.
4) excavation enlarging right side, tunnel top heading 10, construction right side top heading first floor preliminary bracing 4, the interim inverted arch 11 of right side top heading and lock pin ductule 7.
5) base tunnel 12 under excavation enlarging right side, tunnel, base tunnel first floor preliminary bracing 4 under construction right side; Under right side, base tunnel 12 and right side top heading 10 longitudinal pitches should not be greater than 5m, and under right side, under base tunnel 12 and left side, base tunnel 8 longitudinal pitches should not be less than 15 meters.
6) construction enlarging tunnel invert second layer preliminary bracing 13 and inverted arch secondary lining 14;
7) the sidewall temporary lining of base tunnel under dismounting left side top heading and left side, and the interim inverted arch of left side top heading and right side top heading.When temporary lining and interim inverted arch are removed, monitoring measurement be must strengthen, country rock and preliminary bracing 4 deformations grasped in time, and the length that adjustment is once removed according to measurement, once remove longitudinal length and should be less than 1m.Can take measures that if desired preliminary bracing 4 is carried out to part and strengthen, to ensure safety.
8) construction enlarging tunnel arch wall second layer preliminary bracing 13, lays hoop french drain and splash guard, monobloc cast arch wall portion secondary lining 14.
Before the each excavation with guide pit in enlarging tunnel, adopt the construction ancillary methods such as Shed-pipe Advanced Support, advanced tubule slip casting and sidewall advance anchor bolt, when excavation, adopt the controlled blasting technology such as smooth blasting, slight dynamite, presplit blasting, and shake the adverse effect to tunnel surrounding by the strict controlled blasting of the monitoring means such as monitoring of blasting vibration, one time excavation length should be less than 1m.
Reinforced concrete arch wall lining in 2 dismountings of existing tunnel supporting and protection structure is built and is adopted coupling charging structure and enough loaded lengths, thereby forms good free face, causes stress wave multiple reflections, and reinforcing bar and concrete are thrown off, and concrete is fully broken.
The foregoing is only embodiments of the invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes manual of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (6)
1. the excavation method that existing single-hole two track tunnel enlargings are highway tunnel with four lanes, is characterized in that, comprises the following steps:
1) backfill existing tunnel is to its haunch place, and compacting;
2) left side, excavation enlarging tunnel top heading, specifically comprises: remove supporting and protection structure more than existing tunnel haunch, the top heading first floor preliminary bracing of construction left side, sidewall temporary lining, interim inverted arch and lock pin ductule;
3) the lower base tunnel in left side, excavation enlarging tunnel, specifically comprises: remove supporting and protection structure and road surface below existing tunnel haunch, the lower base tunnel first floor preliminary bracing in construction left side and sidewall temporary lining;
4) excavation enlarging right side, tunnel top heading, specifically comprises: construction right side top heading first floor preliminary bracing, interim inverted arch and lock pin ductule;
5) base tunnel under excavation enlarging right side, tunnel, specifically comprises: base tunnel and right side top heading under base tunnel first floor preliminary bracing under construction right side, right side;
6) construction enlarging tunnel invert second layer preliminary bracing and inverted arch secondary lining;
7) the sidewall temporary lining of base tunnel under dismounting left side top heading and left side, and the interim inverted arch of left side top heading and right side top heading;
8) construction enlarging tunnel arch wall second layer preliminary bracing, lays hoop french drain and splash guard, monobloc cast arch wall portion secondary lining.
2. the excavation method that existing single-hole two track tunnel enlargings according to claim 1 are highway tunnel with four lanes, is characterized in that, in step 1), backfill adopts backfill back-filling in layers, and compaction in layers.
3. the excavation method that existing single-hole two track tunnel enlargings according to claim 1 are highway tunnel with four lanes, it is characterized in that, step 2) in the temporary lining of top heading sidewall be arranged on the right positions near existing tunnel supporting and protection structure, lock pin ductule is two, every pin, is less than or equal to 30 ° with the vertical line angle of cut.
4. the excavation method that existing single-hole two track tunnel enlargings according to claim 1 are highway tunnel with four lanes, it is characterized in that, in step 3), lower base tunnel sidewall temporary lining is arranged on the right positions near existing tunnel supporting and protection structure, and connects with the temporary lining of top heading sidewall is suitable.
5. the excavation method that existing single-hole two track tunnel enlargings according to claim 4 are highway tunnel with four lanes, is characterized in that, under left side, base tunnel and left side top heading longitudinal pitch are less than 5m, and seal into ring in time.
6. the excavation method that existing single-hole two track tunnel enlargings according to claim 1 are highway tunnel with four lanes, it is characterized in that, in step 5), under right side, base tunnel and right side top heading longitudinal pitch are less than 5m, and under right side, under base tunnel and left side, base tunnel longitudinal pitch is greater than 15m.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410044970.1A CN103821523A (en) | 2014-02-07 | 2014-02-07 | Excavating method for extending existing single-hole two-driveway tunnel into four-driveway tunnel |
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| CN201410044970.1A CN103821523A (en) | 2014-02-07 | 2014-02-07 | Excavating method for extending existing single-hole two-driveway tunnel into four-driveway tunnel |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106988748A (en) * | 2017-03-15 | 2017-07-28 | 中铁二院工程集团有限责任公司 | High-order parallel heading construction and the construction method that capacity expansion revamping is double line tunnel |
| CN107167355A (en) * | 2017-07-20 | 2017-09-15 | 长安大学 | A kind of liner supporting mould for being applied to indoor tunnel model test |
| CN108181447A (en) * | 2018-02-28 | 2018-06-19 | 招商局重庆交通科研设计院有限公司 | Multispan diameter sand-pebble layer model test apparatus |
| CN109538219A (en) * | 2018-12-21 | 2019-03-29 | 中铁四局集团有限公司 | The enlarging large section in situ and partial excavation method in crushing hard rock tunnel |
| CN109630138A (en) * | 2018-12-21 | 2019-04-16 | 中铁四局集团有限公司 | The steelframe dike combined support partial excavation method of enlarging large section tunnel in situ |
| CN109695457A (en) * | 2018-12-21 | 2019-04-30 | 中铁四局集团有限公司 | The enlarging large section tunnel in situ and step construction method of hard rock |
| CN110374608A (en) * | 2019-08-28 | 2019-10-25 | 贵州大学 | The excavation method in vault direction when a kind of existing tunnel is extended |
| CN110687203A (en) * | 2019-10-29 | 2020-01-14 | 云南航天工程物探检测股份有限公司 | Tunnel inverted arch steel frame ring forming quality detection method based on stress wave signal analysis |
| CN112780286A (en) * | 2020-12-31 | 2021-05-11 | 中铁二十局集团有限公司 | Construction method for rapid expanding excavation conversion when tunnel section suddenly changes into large-span section |
| CN114086992A (en) * | 2021-11-18 | 2022-02-25 | 中铁二院重庆勘察设计研究院有限责任公司 | Large-span tunnel expanding excavation construction method under complex geological conditions |
| CN114961739A (en) * | 2022-05-16 | 2022-08-30 | 中铁五局集团有限公司 | Construction method for re-excavation and expanded excavation of abandoned tunnel |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106988748A (en) * | 2017-03-15 | 2017-07-28 | 中铁二院工程集团有限责任公司 | High-order parallel heading construction and the construction method that capacity expansion revamping is double line tunnel |
| CN107167355A (en) * | 2017-07-20 | 2017-09-15 | 长安大学 | A kind of liner supporting mould for being applied to indoor tunnel model test |
| CN107167355B (en) * | 2017-07-20 | 2024-05-07 | 长安大学 | Lining support die suitable for indoor tunnel model test |
| CN108181447A (en) * | 2018-02-28 | 2018-06-19 | 招商局重庆交通科研设计院有限公司 | Multispan diameter sand-pebble layer model test apparatus |
| CN108181447B (en) * | 2018-02-28 | 2023-07-18 | 招商局重庆交通科研设计院有限公司 | Multi-span sandy pebble stratum model test device |
| CN109538219B (en) * | 2018-12-21 | 2020-10-20 | 中铁四局集团有限公司 | In-situ expansion super-large section and partial excavation method of broken hard rock tunnel |
| CN109695457A (en) * | 2018-12-21 | 2019-04-30 | 中铁四局集团有限公司 | The enlarging large section tunnel in situ and step construction method of hard rock |
| CN109630138A (en) * | 2018-12-21 | 2019-04-16 | 中铁四局集团有限公司 | The steelframe dike combined support partial excavation method of enlarging large section tunnel in situ |
| CN109538219A (en) * | 2018-12-21 | 2019-03-29 | 中铁四局集团有限公司 | The enlarging large section in situ and partial excavation method in crushing hard rock tunnel |
| CN110374608A (en) * | 2019-08-28 | 2019-10-25 | 贵州大学 | The excavation method in vault direction when a kind of existing tunnel is extended |
| CN110374608B (en) * | 2019-08-28 | 2021-08-31 | 贵州大学 | Method for excavating vault direction during existing tunnel extension |
| CN110687203A (en) * | 2019-10-29 | 2020-01-14 | 云南航天工程物探检测股份有限公司 | Tunnel inverted arch steel frame ring forming quality detection method based on stress wave signal analysis |
| CN112780286A (en) * | 2020-12-31 | 2021-05-11 | 中铁二十局集团有限公司 | Construction method for rapid expanding excavation conversion when tunnel section suddenly changes into large-span section |
| CN114086992A (en) * | 2021-11-18 | 2022-02-25 | 中铁二院重庆勘察设计研究院有限责任公司 | Large-span tunnel expanding excavation construction method under complex geological conditions |
| CN114086992B (en) * | 2021-11-18 | 2024-05-03 | 中铁二院重庆勘察设计研究院有限责任公司 | Large-span tunnel expanding and excavating construction method under complex geological conditions |
| CN114961739A (en) * | 2022-05-16 | 2022-08-30 | 中铁五局集团有限公司 | Construction method for re-excavation and expanded excavation of abandoned tunnel |
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Application publication date: 20140528 |